import Vue from 'vue';
import VueRouter from 'vue-router';

// import Login from '../components/Login.vue';
// import Home from '../components/Home.vue';
// import Welcome from '../components/Welcome.vue';
// import Users from '../components/user/Users.vue';
// import Rights from '../components/power/Right.vue';
// import Roles from '../components/power/Roles.vue';
// import Categories from '../components/goods/Categories.vue';
// import Params from '../components/goods/Params.vue';
// import GoodsList from '../components/goods/List.vue';
// import GoodsAdd from '../components/goods/Add.vue';
// import Order from '../components/order/Order.vue';
// import Report from '../components/report/Report.vue';

// 路由懒加载
const Login = () => import(/* webpackChunkName: "login_Home_Welcome" */ '../components/Login.vue');
const Home = () => import(/* webpackChunkName: "login_Home_Welcome" */ '../components/Home.vue');
const Welcome = () => import(/* webpackChunkName: "login_Home_Welcome" */ '../components/Welcome.vue');

const Users = () => import(/* webpackChunkName: "Users_Rights_Roles" */ '../components/user/Users.vue');
const Rights = () => import(/* webpackChunkName: "Users_Rights_Roles" */ '../components/power/Right.vue');
const Roles = () => import(/* webpackChunkName: "Users_Rights_Roles" */ '../components/power/Roles.vue');

const Categories = () => import(/* webpackChunkName: "Cate_Params" */ '../components/goods/Categories.vue');
const Params = () => import(/* webpackChunkName: "Cate_Params" */ '../components/goods/Params.vue');

const GoodsList = () => import(/* webpackChunkName: "GoodsList_Add" */ '../components/goods/List.vue');
const GoodsAdd = () => import(/* webpackChunkName: "GoodsList_Add" */ '../components/goods/Add.vue');

const Order = () => import(/* webpackChunkName: "Order_Report" */ '../components/order/Order.vue');
const Report = () => import(/* webpackChunkName: "Order_Report" */ '../components/report/Report.vue');

Vue.use(VueRouter);

const routes = [{
    path: '/',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [{
        path: '/welcome',
        component: Welcome
      },
      {
        path: '/users',
        component: Users
      },
      {
        path: '/rights',
        component: Rights
      },
      {
        path: '/roles',
        component: Roles
      },
      {
        path: '/categories',
        component: Categories
      },
      {
        path: '/params',
        component: Params
      },
      {
        path: '/goods',
        component: GoodsList
      },
      {
        path: '/goods/add',
        component: GoodsAdd
      },
      {
        path: '/orders',
        component: Order
      },
      {
        path: '/reports',
        component: Report
      }
    ]
  }
];

const router = new VueRouter({
  routes
});

// 挂载路由导航守卫控制访问权限
// 为路由对象，添加 beforeEach 导航守卫
router.beforeEach((to, from, next) => {
  // to 代表将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  //     第一种 next() 直接放行；第二种 next('/login') 强制跳转指定页面

  // 如果用户访问的登录页，直接放行
  if (to.path === '/login') return next();
  // 从 sessionStorage 中获取保存的 token 值
  const tokenStr = window.sessionStorage.getItem('token');
  // 没有 token，强制跳转到登录页
  if (!tokenStr) return next('/login');
  next();
});

export default router;
